Bosch Dishwasher Error Code HIGHVOLT

HIGHVOLT means the dishwasher has detected that the incoming mains voltage is above its maximum safe limit, which is 160V for US models and 265V for EU and AU models. The unit shuts down automatically to prevent damage to its electronics, motor, and other components. This is a protective fault and the appliance will not resume operation until the voltage condition is resolved.

No, you should not attempt to run the dishwasher while this error is active. Overvoltage conditions can damage the control board, wash motor, heating element, and wiring inside the appliance. The dishwasher's automatic shutoff is a protection feature, and bypassing it by resetting the unit without correcting the voltage issue risks permanent component damage or an electrical hazard.

If the issue is in your home's electrical supply, electrician costs typically range from $100 to $400 depending on the nature of the fault and local labor rates. If the dishwasher's main control board has been damaged by overvoltage or its sensing circuit has failed, control board replacement parts and labor can range from $200 to $500. In cases where the supply voltage is normal and no internal damage has occurred, there may be no parts cost at all.

Start by measuring the actual voltage at the electrical supply point for the dishwasher using a multimeter. If the voltage exceeds 160V on a US installation or 265V on a EU or AU installation, the problem is in the home's electrical supply and you should contact a licensed electrician. If the measured voltage is within the normal range, the control board's voltage sensing circuit may be faulty and require replacement.

A reset may temporarily clear the error code, but if the underlying overvoltage condition still exists, the fault will return as soon as the control board samples the supply voltage again. You need to resolve the root cause of the high voltage before a reset will result in the dishwasher operating normally. Always verify supply voltage with a multimeter before and after resetting.